It is extremely important that the performance of industrial fans to be measured, to confirm constructive calculations carried out a priori of their choice. Only after this can install a fan in the desired industrial location assuring that it will fulfill the technological functions and / or the ambient requested by the customer.
It was seen in a previous article that the airflow can be calculated with the following formula:
room volume [m3] x number of shifts per hour [1 / h] = air flow [m3 / h]
According to a definition almost unanimously accepted in geography, geology, hydrology, fluid dynamics and engineering, the flow rate is the volume of a fluid, liquid or gas, passing a long drive through the cross section of flow of a river, stream, a fountain, wells, pipelines etc. Knowing the flow rate is important for sizing industrial fan volumetric chosen so that they can provide the number of shifts of fluid or gas per unit of time, usually within an hour, necessary to achieve the purpose for which this industrial fan is working.
In any ventilation system, especially in one industrial ventilation that needs fully functional dynamic equilibrium and knowledge, it is also necessary another second variable in the equation, utmost essential for its functioning. This is the pressure of the gaseous fluid which is circulated by the industrial fan.
Dynamic pressure, usually denoted PDIN is the additional pressure of a fluid that would hit the surface and would be forced to consume its full kinetic energy. For this reason, the pressure is influenced by the diameter, length and material from which the pipe is made. Dynamic pressure is used to calculate pressure drops in piping systems. Technical solutions exist both for pressure and for reducing them. In the particular case of the fan duct it is essential to take into account the available static pressure, as this determines the maximum length of the section ventilation. Depending on the length of the tubing section miscarriages can occur and therefore a decrease in yield industrial fan duct on the farthest portion of the ventilation system because of its aspiration ability decreases as the distance increases.
Depending on the correlation in dynamic equilibrium permanent of these two parameters, the flow rate and dynamic pressure PDIN and relationships mathematical-physical that define their operation and that we reviewed in previous articles, the fans are divided into various classes operating with such as low pressure and high flow rates, pressures and flow media environments, high pressure and high flow rates and various other combinations thereof. These combinations determine the choice of industrial fan for a certain type of operation that responds best goal.
Thank you and wait to meeting you in the next pages. Or, even better, in our factory …
Lucian GOJ, Research & Development Director,
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